JP2000132721A - Automatic toll collection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent incorrect communication by specifying a communication vehicle with a simple system about an automatic toll collection system utilizing radio communication. SOLUTION: 1st and 2nd transmitters 100 and 103 and 1st to 3rd receivers 101, 104 and 106 which transmit and receive 1st to 3rd infrared laser beams 102, 105 and 107 are installed at traffic lane sides before a communication area and a communication area 111. It is possible to decide to specify whether communication is performed with a vehicle in the communication area or a vehicle other than it and to prevent incorrect communication from a trigger pulse 112 outputted to a speed detector 113 when the vehicle 110 goes across the 1st to 3rd infrared laser beams by providing the speed detector 113, a travel distance detector 114, a vehicle position detector 115, a received power calculator 116 and a communication deciding device 117.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic toll collection system using wireless communication.

[0002]

2. Description of the Related Art In a conventional automatic toll collection system, when a vehicle not equipped with an on-vehicle wireless device enters a dedicated lane for automatic toll collection or a lane mixed with general vehicles, and the system operates normally. The traffic light turns red because normal communication is not performed in the communication area, and temporarily stops,
The charge will be collected by the staff.

The communication area of a tollgate is limited by a beam forming array antenna or the like of a roadside apparatus. However, a vehicle outside the communication area is affected by a margin of a communication line or a variation in reception sensitivity of a vehicle-mounted apparatus. There is a possibility that communication with is established. If a vehicle enters the toll booth at a very short inter-vehicle distance due to a large traffic volume at the toll booth, the preceding vehicle does not have the onboard wireless device, and then the following vehicle with the onboard wireless device immediately enters. If you estimate that
Communication is established when the following vehicle outside the communication area receives the leaked radio wave from the communication area, the roadside device recognizes that the preceding vehicle is communicating, and the preceding vehicle without the onboard wireless device is installed. May pass through toll booths without paying.

[0004] In addition, even if the preceding vehicle is equipped with a vehicle-mounted wireless device, if the mounting position is not appropriate or if the reception sensitivity is not very good, the vehicle-mounted wireless device and the roadside wireless device of the following vehicle outside the communication area are not connected. In some cases, communication may be performed first, and a charge may not be collected from the preceding vehicle even though the preceding vehicle has the in-vehicle wireless device.

As a conventional example for solving such a problem,
For example, JP-A-7-6236 discloses an automatic toll collection system for measuring the position of a communication vehicle.

FIG. 5 shows a conventional false communication prevention system.
In this system, as shown in FIG. 5, the toll booth includes an infrared communication device IRK, an IR beacon IRB, and a video device N.
V, a radar device RD for capturing the positions of all vehicles FZ1, FZ2, FZ3, and an infrared video device IVR, and an infrared signal generator R is additionally provided in the vehicle.

In this system, the infrared signal OS is transmitted from the vehicle FZ1 at the same time when the communication of toll collection ends, and the position of the vehicle is detected by the infrared video device IVR. All the vehicles FZ1, FZ2,
Since the position of FZ3 has been captured, the unpaid vehicle FZ2 is identified by matching the infrared video and radar information with the correlator COR of the control and evaluation device SAE. This conventional system requires the above-mentioned many additional devices, complicates the system configuration, and increases the cost of the entire system.

[0008]

The communication area of the toll booth is limited by the beam forming array antenna of the roadside apparatus, but it is assumed that the margin of the communication line and the variation of the receiving sensitivity of the onboard radio apparatus are assumed. Therefore, communication with a vehicle outside the communication area may be established. If a vehicle enters the toll booth at a very short inter-vehicle distance due to a large traffic volume at the toll booth, the preceding vehicle does not have the onboard wireless device, and then the following vehicle with the onboard wireless device immediately enters. When the vehicle comes, the following vehicle outside the communication area receives the leaked radio wave from the communication area and the communication is established, the roadside wireless device recognizes that the preceding vehicle is communicating, and the onboard wireless device is installed. There is a possibility that an unprecedented vehicle will pass through the toll booth without paying a fee.

[0009] Further, even if the preceding vehicle is equipped with a vehicle-mounted wireless device, if the mounting position is not appropriate or the reception sensitivity is not very good, the vehicle-mounted wireless device and the roadside wireless device of the following vehicle outside the communication area are not connected. In some cases, communication may be performed first, and a charge may not be collected from the preceding vehicle even though the preceding vehicle has the in-vehicle wireless device.

[0010] It is an object of the present invention to prevent communication errors by specifying a communication vehicle with a simple system.

[0011]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention relates to a roadside wireless device installed at a tollgate such as a toll road and an on-vehicle wireless device mounted on a vehicle passing through the tollgate. In the automatic toll collection system that automatically collects tolls by wireless communication, the first laser beam is positioned at one side of the traveling lane in front of the communication area and is rotated by 90 degrees with respect to the traveling direction of the traveling lane. And a first trigger pulse when the vehicle crosses the first laser beam while receiving the first laser beam located on the other side of the traveling lane. Output the first
And the second laser light and the third laser light, which are located on one side of the traveling lane at the end of the communication area where the vehicle is entering, and which are 90 degrees apart from the traveling direction of the traveling lane, respectively.
A second transmitter which emits in the direction of 90 degrees and in the direction of 90 degrees + θ in the communication area direction, and a 90 degrees direction from the second transmitter located on the other side of the traveling lane at the end of the communication area. A second receiver for receiving a second laser beam emitted from the second receiver and outputting a second trigger pulse when the vehicle crosses the second laser beam; and a second receiver located beside a communication area on the second receiver side. And the third transmitter, which exits in the 90 ° + θ direction from the second transmitter,
And a third receiver that outputs a third trigger pulse when a vehicle crosses the third laser beam and the first, second, and third trigger pulses are transmitted to a communication area using the first, second, and third trigger pulses. A speed detector that detects the speed of the vehicle that has entered, a moving distance detector that detects the moving distance of the vehicle using the data of the speed detector, and a moving distance detector that uses the data of the moving distance detector. A vehicle position detector for detecting a position, a reception power calculator for calculating a distance from the position of the vehicle to the roadside wireless device and estimating a reception power value from the vehicle, and a reception power actually received by the roadside wireless device A communication determining unit that determines a normal communication by comparing the received power value with the received power value estimated by the received power calculator.

According to the present invention, the communication vehicle can be specified by a simple system, so that erroneous communication can be prevented.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
An automatic toll collection system that automatically collects tolls by wireless communication between a roadside wireless device installed at a tollgate such as a toll road and a vehicle-mounted wireless device mounted on a vehicle passing through the tollgate, A first transmitter located on one side of the traveling lane in front of the communication area and emitting the first laser light in a direction at 90 degrees to the traveling direction of the traveling lane; A first receiver that receives the first laser light and outputs a first trigger pulse when a vehicle crosses the first laser light;
The second laser light and the third laser light are positioned on one side of the traveling lane at the end of the communication area where the vehicle enters, and the communication area is in a direction at 90 degrees to the traveling direction of the traveling lane. A second transmitter that emits in the direction of 90 degrees + θ inward, and a second transmitter that is located on the other side of the traveling lane at the end of the communication area and exits from the second transmitter in a direction of 90 degrees. A second receiver for receiving a laser beam and outputting a second trigger pulse when a vehicle crosses the second laser beam; and a second receiver positioned beside a communication area on the second receiver side. A third receiver that receives a third laser beam emitted in a 90 ° + θ direction from a transmitter and outputs a third trigger pulse when a vehicle crosses the third laser beam; and the first and second receivers. 2. The speed of the vehicle entering the communication area using the third trigger pulse A speed detector for detecting a degree, a moving distance detector for detecting a moving distance of the vehicle using data of the speed detector, and a vehicle for detecting a position of the vehicle using data of the moving distance detector A position detector, a reception power calculator for calculating a distance from the position of the vehicle to the roadside apparatus and estimating a reception power value from the vehicle, a reception power value actually received by the roadside apparatus and the reception power An automatic toll collection system comprising: a communication judging unit for judging normal communication by comparing the received power value estimated by the calculator with a communication judging unit. This has the effect that normal communication can be determined by the determiner.

According to a second aspect of the present invention, further, the fourth laser light and the fifth laser light are transmitted between the first and second transmitters located on one side of the traveling lane in front of the communication area. A third transmitter that emits in a direction of 90 degrees with respect to the traveling direction of the traveling lane and in a direction of 90 degrees + θ oblique to the vehicle traveling direction,
A fourth trigger pulse is received when the vehicle crosses the fourth laser beam while receiving a fourth laser beam emitted in the 90-degree direction from the third transmitter and located on the other side of the traveling lane. And a fifth receiver positioned between the second and fourth receivers and receiving the fifth laser light emitted from the third transmitter in the 90 ° + θ direction. And a fifth receiver that outputs a fifth trigger pulse when the vehicle crosses the laser light of
The first, second, third, fourth, and fifth trigger pulses are used to detect the speed of vehicle A entering the communication area and the speed of vehicle B outside the communication area. Detecting the moving distance of the vehicle A and the vehicle B using data of a detector, the vehicle position detector detects the position of the vehicle A and the vehicle B using the data of the moving distance detector, The received power calculator calculates the distance from the position of the vehicles A and B to the roadside wireless device to estimate the received power value from the vehicles A and B, and the communication determiner actually receives the roadside wireless device. 2. The automatic toll collection system according to claim 1, wherein a normal communication is determined by comparing a reception power value with the reception power value estimated by the reception power calculator. The position can be detected and normal communication can be judged by the communication judgment unit. It has the effect of say.

According to a third aspect of the present invention, there is provided an automatic toll collection system according to the second aspect, wherein the second receiver and the fifth receiver are shared to reduce the number of receivers by one. This has the effect that the installation cost can be reduced, the vehicle position in the communication area can be easily detected, and normal communication can be determined by the communication determiner.

According to a fourth aspect of the present invention, in place of the first transmitter, the first receiver, and the first laser beam, a first tread plate which detects passage of a vehicle and outputs a first trigger pulse. When,
Instead of the second transmitter, the second receiver, and the second laser beam, a second tread plate that detects passage of a vehicle and outputs a second trigger pulse, a second transmitter, a third 2. The automatic toll collection system according to claim 1, wherein a third step plate for detecting passage of the vehicle and outputting a third trigger pulse is used in place of the receiver and the third laser beam. This has the effect that the position of the vehicle in the communication area can be easily detected and normal communication can be determined by the communication determiner.

According to a fifth aspect of the present invention, there is provided the automatic toll collection system according to the first aspect, wherein the angle of θ of the laser beam emitted in the direction of 90 + θ is smaller than 30 degrees. This has the effect that the vehicle position can be detected earlier, the vehicle position in the communication area can be easily detected, and normal communication can be determined by the communication determiner.

According to a sixth aspect of the present invention, further, the fourth laser light is directed to the position of the second receiver in the communication area inward direction.
A third transmitter that emits light in the direction of degree + θ, and a fourth receiver that receives the fourth laser light is provided beside a traveling lane where the second transmitter is located. 2. The automatic toll collection system according to claim 1, wherein the vehicle position can be detected at an early point even if the traveling position of the vehicle is deviated to the left or right, and the vehicle position in the communication area can be easily detected, and the communication determination unit determines the vehicle position. It has the effect that normal communication can be determined.

According to a seventh aspect of the present invention, there are provided a first transmitter, a second transmitter, a first receiver, a second receiver, a first laser, a second laser, a third laser, a speed detector, a moving distance detector, 2. The automatic toll collection system according to claim 1, wherein the vehicle position detector and the received power calculator are removed, and the communication is determined only by the received power value of the transmission radio wave from the vehicle. It has the effect that normal communication can be determined.

The invention according to claim 8 further comprises side antennas located on both sides of the roadside apparatus and connected to the roadside apparatus and facing the direction of the adjacent lane. 7. The automatic toll collection system according to any one of 7, wherein the communication judging device can determine an erroneous communication with an adjacent lane.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a schematic diagram of an erroneous communication prevention system of an automatic toll collection system according to the present embodiment. In FIG. 1, 100 is a first transmitter, 101 is a first receiver, 102 is a laser beam such as a first infrared ray, 103 is a second transmitter, 104 is a second receiver, and 105 is a second receiver. 2 laser light such as infrared rays, 106 a third receiver, 107
Is a laser light such as a third infrared ray, 108 is a roadside wireless device, 109 is a vehicle-mounted wireless device, 110 is a vehicle, 111 is a communication area, 112 is a trigger pulse, 113 is a speed detector, 114 is a moving distance detector, 115 Is a vehicle position detector, 116 is a received power calculator, 117 is a communication determiner, 1
Reference numeral 18 denotes a traveling lane end A, and 119 denotes a traveling lane end B.

The operation of the above configuration will be described below. Travel lane edge A118 before communication area 111
A first infrared laser beam 102 using, for example, infrared light is emitted from the first transmitter 100 in a direction at 90 degrees to the traveling direction of the traveling lane, and the first infrared laser beam 102 is transmitted by the first receiver 101 at the traveling lane end B119. One infrared laser beam 102 is received. The second infrared laser beam 105 is transmitted from the second transmitter at the traveling lane end A at the communication area end toward which the vehicle 110 enters into the third lane in the direction of 90 degrees with respect to the traveling direction of the traveling lane. The infrared laser beam 107 is emitted in the direction of 90 degrees + θ in the communication area 111.

The second infrared laser beam 105 emitted from the second transmitter 103 in the direction of 90 degrees is transmitted to the second
Of the second transmitter 103 to 90
The third infrared laser beam 107 emitted in the degree + θ direction is received by the third receiver 106 at the traveling lane end B. When the vehicle 110 passes between the first transmitter 100 and the first receiver 101, the first receiver sends a trigger pulse t1 to the speed detector 113, and the second transmitter 103 and the second transmitter When passing between the receivers 104, the second receiver sends a trigger pulse t2 to the speed detector 113. Time (t2-t1)
Then, the speed detector 113 detects the approach speed v of the vehicle into the communication area 111 from the distance L known in advance between the first and second transmitters.

Next, when the vehicle 110 passes between the second transmitter 103 and the third receiver 106, the third receiver 106 sends a trigger pulse t3 and the moving distance detector 1
14 is a moving distance y from the communication area entrance end based on the time (t3−t2) and the speed v detected by the speed detector 113.
Is calculated.

Next, the vehicle position detector 115 calculates the vehicle position of the vehicle 110 from the moving distance y and the preset angle θ.

Next, the reception power calculator 116 calculates the distance from the vehicle position of the vehicle 110 that has entered the communication area, calculated by the vehicle position detector 115, to the roadside apparatus,
A predicted received power value from the vehicle is predicted. The communication determiner 117 receives the received power value from the on-board wireless device 109 actually received by the roadside wireless device 108 and the received power calculator 1
16 is compared with the predicted received power value, and if the error is within a predetermined error, it is determined that the communication is normal. If the error exceeds the predetermined error, communication with a vehicle other than the vehicle 110 in the communication area is established first. Then, it is determined that the communication has been started, and it is determined that the communication is erroneous. For example, the communication is stopped.

As described above, according to the present embodiment, a vehicle can be identified by such a simple system, and erroneous communication can be prevented.

Instead of the first transmitter 100, the first receiver 101, and the first laser beam 102, a first tread plate for detecting the passage of a vehicle, a second transmitter 103, a second
Of the receiver 104 and the second laser beam 105, a second tread plate for detecting the passage of the vehicle, and the second transmitter 10
3. Instead of the third receiver 106 and the third laser beam 107, a third tread plate for detecting passage of a vehicle may be used.

Further, it is desirable that the angle θ of the laser beam emitted in the direction of 90 ° + θ is smaller than 30 ° so that the vehicle position can be detected earlier at the time of entering the communication area.

As a simpler method, the first, second,
Transmitters 100 and 103, first, second and third receivers 10
1, 104, 106, first, second, third laser light 102,
105, 107, speed detector 113, moving distance detector 1
14, the vehicle position detector 115 and the received power detector 116 may be omitted, and the communication determination as to the one in the communication area or the one outside the communication area may be made only by the received power value of the transmission wave from the vehicle 110.

(Embodiment 2) FIG. 2 is a schematic diagram of an erroneous communication prevention system of an automatic toll collection system according to the present embodiment. In FIG. 2, reference numeral 200 denotes a first transmitter, 20
1 is a first receiver, 202 is a laser beam such as a first infrared ray, 203 is a second transmitter, 204 is a second receiver, 2
05 is a laser beam such as a second infrared ray, 206 is a third receiver, 207 is a laser beam such as a third infrared ray, 208 is a third transmitter, 209 is a fourth receiver, and 210 is a fourth receiver. Laser light such as infrared light, 211 is a fifth receiver, 212
Is a laser beam such as a fifth infrared ray, 213 is a communication area,
214 is a trigger pulse, 215 is a roadside apparatus, 216
Is an on-vehicle wireless device A, 217 is a vehicle A, 218 is an on-vehicle wireless device B, 219 is a vehicle B, 220 is a speed detector, 221
Is a moving distance detector, 222 is a vehicle position detector, 223 is a received power calculator, 234 is a communication determiner, 225 is a traveling lane end A, and 226 is a traveling lane end B.

The operation of the above configuration will be described below. Travel lane edge A225 before communication area 213
A first infrared laser beam 202 using, for example, infrared light is emitted from the first transmitter 200 in a direction at 90 degrees to the traveling direction of the traveling lane, and the first infrared laser beam 202 is transmitted by the first receiver 201 at the traveling lane end B226. One infrared laser beam 202 is received. The second infrared laser beam 205 from the second transmitter 203 at the traveling lane end A 225 at the communication area end where the vehicle A enters enters the third lane in the direction of 90 degrees with respect to the traveling direction of the traveling lane. Infrared laser beam 207 is transmitted to communication area 21
3 Put out in the direction of 90 ° + θ inside.

The second infrared laser beam 205 emitted from the second transmitter 203 in the direction of 90 degrees is transmitted to the traveling lane end B226.
The third infrared laser light 207 received by the second receiver 204 and emitted from the second transmitter 203 in the direction of 90 ° + θ.
Is received by the third receiver 206 at the traveling lane end B226.

The traveling lane end A before the communication area
225 between the first and second transmitters 200, 203
The fourth infrared laser beam 210 and the fifth infrared laser beam 212 are respectively transmitted from the transmitter 208 of the vehicle in a direction 90 degrees with respect to the traveling direction of the traveling lane and at an angle of 90 degrees with respect to the traveling direction of the vehicle.
In the direction of degree + θ. The fourth infrared laser beam 210 emitted from the third transmitter 208 in the 90-degree direction is received by the fourth receiver 209 at the traveling lane end B, and the third transmitter 20
Fifth infrared laser beam 21 emitted from 8 to 90 degrees + θ direction
2 is received by the fifth receiver 211 at the end of the traveling lane B between the second and fourth receivers 204 and 209.

First transmitter 200 and first receiver 201
Receiver 201 when vehicle B 219 passes between
Sends a trigger pulse t1 to the speed detector 220,
Between the transmitter 208 and the fourth receiver 209 of the vehicle B21
9 passes, the fourth receiver 209 outputs the speed detector 2
The trigger pulse t2 is sent to 20. When the vehicle B passes between the third transmitter 208 and the fifth receiver 211, the fifth receiver 211 sends a trigger pulse t3 to the speed detector 220.
Send.

Further, when the vehicle A 217 passes between the third transmitter 208 and the fourth receiver 209, the fourth receiver 209 sends a trigger pulse t4 to the speed detector 220, and the second transmission The second receiver 204 sends a trigger pulse t5 to the speed detector 220 when the vehicle A passes between the device 203 and the second receiver 204. Second transmitter 203
When the vehicle A passes between the second receiver 206 and the third receiver 206, the third receiver 206 sends a trigger pulse t 6 to the speed detector 220. From the time (t2-t1) and the known distance L1 between the first and third transmitters, the vehicle B
219 is calculated by the speed detector 220, and the time (t3−t2) and the speed v detected by the speed detector 220 are calculated.
1, the moving distance detector 221 detects the vehicle B 219
The moving distance y1 between the third transmitter 208 and the fourth receiver 209 is calculated.

Next, the vehicle position detector 222 calculates the moving distance y
The vehicle position of the vehicle B 219 outside the communication area is calculated from 1 and the angle θ. Next, the speed detector 220 determines the time (t5−
From the time t4) and the distance L2 known in advance between the third and second transmitters, the speed v2 of the vehicle A217 is calculated, and the moving distance calculator 221 calculates the time (t6-t5),
From the speed v2 detected by the speed detector 220, the moving distance y between the second transmitter 203 and the second receiver 204
2 is calculated.

Next, the vehicle position detector 222 calculates the moving distance y
2 and the angle θ between the second transmitter 203 and the third receiver 206, the vehicle position of the vehicle A217 in the communication area 213 is calculated.

The reception power calculator 223 is provided for the communication area 21
3 and the vehicle B21 outside the communication area 213.
9 and the distance to the roadside apparatus 215 are determined, and the predicted received power value from each vehicle is predicted. The communication determiner 224 compares the received power value actually received by the roadside apparatus 215 with the predicted received power value from the vehicle A 217 in the communication area 213 by the received power calculator 223, and within a determined error. In some cases, the communication is determined to be normal communication, and the communication is continued as it is. Further, the vehicle outside the communication area 213 and the roadside wireless device 215 start communication before the vehicle A217 in the communication area 213, and the roadside wireless device 215 is started. Is the communication area 2
If it is close to the predicted received power value of the vehicle B219 outside the thirteenth, the communication is determined to be erroneous.

As described above, according to the present embodiment, a vehicle can be specified by such a simple system, and erroneous communication can be prevented.

In order to reduce the installation cost, the second receiver 204 and the fifth receiver 211 may be shared to reduce the number of receivers by one.

(Embodiment 3) FIG. 3 is a schematic diagram of an erroneous communication prevention system of the automatic toll collection system according to the present embodiment. In FIG. 3, reference numeral 300 denotes a first transmitter, 30
1 is a first receiver, 302 is a laser beam such as a first infrared ray, 303 is a second transmitter, 304 is a second receiver, 3
05 is a laser beam such as a second infrared ray, 306 is a third receiver, 307 is a laser beam such as a third infrared ray, 308 is a third transmitter, 309 is a fourth receiver, and 310 is a fourth receiver. 311 is a communication area, 312 is a trigger pulse, 313 is a roadside wireless device, 314 is a vehicle-mounted wireless device, 315 is a vehicle, 316 is a speed detector, 317 is a moving distance detector, and 318 is a vehicle position. A detector 319 is a received power calculator, 320 is a communication determiner, 321 is a running lane end A, and 322 is a running lane end B.

The operation of the above configuration will be described below. Travel lane edge A32 before communication area 311
The first infrared laser beam 30 from the first transmitter 300
2 in the direction of 90 degrees with respect to the traveling direction of the traveling lane, and the first receiver 301 at the traveling lane end B322 outputs the first signal.
Receiving the infrared laser beam 302 of the above.

From the second transmitter 303 at the traveling lane end A321 at the end of the communication area where the vehicle 315 enters,
Second infrared laser light 305 and third infrared laser light 3
07 in the direction of 90 degrees with respect to the traveling direction of the traveling lane and in the direction of 90 degrees + θ with respect to the inside of the communication area 311.

The second infrared laser beam 305 emitted from the second transmitter 303 in the direction of 90 degrees is received by the second receiver 304 at the traveling lane end B322 at the end of the communication area. The third infrared laser beam 307 emitted in the 90 ° + θ direction from the third lane 322 is received by the third receiver 306 at the traveling lane end B322.

From the third transmitter 308 at the traveling lane end B322 at the end of the communication area where the vehicle 315 enters,
The fourth infrared laser light 310 is emitted in the direction of 90 degrees + θ in the communication area 311 and the fourth infrared laser light 31 is output by the fourth receiver at the traveling lane end A321 at the end of the communication area.
0 is received.

First transmitter 300 and first receiver 301
315 passes through the first infrared laser beam 30
2, when the first receiver 301 detects the speed detector 3
When a second trigger pulse t1 is sent to the second detector 16 and the second infrared laser beam 305 passes through the second transmitter 303 and the second receiver 304 and crosses the second infrared laser beam 305, the speed detector 3
A trigger pulse t2 is sent to 16 and time (t2-t1)
From the known distance L between the first and second transmitters, the speed detector 316 detects the speed v at which the vehicle enters the communication area 311.

The vehicle 315 has the fourth infrared laser beam 310
When the laser beam traverses the third infrared laser beam 307 earlier than before, when passing between the second transmitter 303 and the third receiver 306, the receiver 306 sends a trigger pulse t3 to the speed detector 316. From the time (t3−t2) and the speed v detected by the speed detector 316, the moving distance detector 31
7 detects the moving distance y1 from the communication area entrance end. From the movement distance y1 and the angle θ, the vehicle position detector 318
Detects the position of the vehicle 315 from the traveling lane end A321.

Alternatively, when the vehicle crosses the fourth infrared laser beam 310 before the third infrared laser beam 307, the vehicle passes between the third transmitter 308 and the fourth receiver 309. The receiver 309 sends a trigger pulse t3 to the speed detector 316, and calculates the moving distance detector 3 based on the time (t3-t2) and the speed v detected by the speed detector 316.
Reference numeral 17 detects a moving distance y1 from the entrance end of the communication area. From the movement distance y1 and the angle θ, the vehicle position detector 318
Detects the position of the vehicle 315 from the traveling lane end B.

From the vehicle position of the vehicle entering the communication area and the distance to the roadside apparatus 313, the received power calculator 319 predicts a predicted received power value from the vehicle. The communication determiner 320 compares the received power value actually received by the roadside apparatus 313 with the predicted received power value by the received power calculator 319, and determines that the communication is normal if the error is within a predetermined error. If the difference exceeds a predetermined error, it is determined that communication has been established and started communication with a vehicle other than the vehicles in the communication area first, and it is determined that communication is erroneous.

As described above, according to the present embodiment, the vehicle 31 out of the two intersecting laser beams 307 and 311 comes first.
By using the trigger pulse crossed by 5, the vehicle position can be detected early and accurately, and erroneous communication can be prevented.

(Embodiment 4) FIG. 4 is a schematic diagram of an erroneous communication prevention system of an automatic toll collection system according to this embodiment. In FIG. 4, reference numeral 400 denotes a first transmitter, 40
1 is a first receiver, 402 is a laser beam such as a first infrared ray, 403 is a second transmitter, 404 is a second receiver,
05 is a laser beam such as a second infrared ray, 406 is a third receiver, 407 is a laser beam such as a third infrared ray, 408 is a roadside apparatus, 409 is an onboard radio apparatus, 410 is a vehicle,
411 is a communication area, 412 is a trigger pulse, 413 is a speed detector, 414 is a moving distance detector, 415 is a vehicle position detector, 416 is a received power calculator, 417 is a communication determiner, and 418 is the transmission / reception beam direction adjacent. A side antenna 419 toward the lane is a running lane end A, and a 420 is a running lane end B.

The operation of the above configuration will be described below. First, the vehicle position of vehicle 410 is determined by the operation described in (Embodiment 1). Received power calculator 4
Reference numeral 16 predicts a predicted received power value from the vehicle from the vehicle position of the vehicle 410 that has entered the communication area 411 and the distance to the roadside apparatus 408.

Next, the communication determination unit 417 calculates the reception power value actually received by the roadside apparatus 408 and the reception power calculation unit 4.
The erroneous communication is determined on the basis of the predicted received power value obtained by S.16 and the received power value of the side antenna 418. That is, when the predicted received power value exceeds the determined error, it is determined that communication has been established and started communication with a vehicle other than the vehicles in the communication area, and the received power value of the side antenna 418 is determined. If it is larger than the specified value, it is determined that the communication error is due to the reception of the transmission wave from the on-vehicle wireless device mounted on the vehicle traveling in the adjacent lane.

As described above, according to the present embodiment, a vehicle can be identified by such a simple system, and erroneous communication can be prevented.

[0056]

As described above, according to the present invention, a roadside radio device installed at a tollgate on a toll road and an on-vehicle radio device mounted on a vehicle passing through the tollgate on the toll road, In an automatic toll collection system that automatically collects tolls by wireless communication, the position of a vehicle entering a tollgate can be easily detected from the time of crossing a laser beam such as infrared light without complicating the system. Can be
The effect is that normal toll collection is possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an erroneous communication prevention system of an automatic toll collection system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of an erroneous communication prevention system of the automatic toll collection system according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of an erroneous communication prevention system of the automatic toll collection system according to one embodiment of the present invention.

FIG. 4 is a schematic diagram of an erroneous communication prevention system of an automatic toll collection system according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of a conventional false communication prevention system.

[Explanation of symbols]

100, 200, 300, 400 First transmitter 101, 201, 301, 401 First receiver 102, 202, 302, 402 First infrared laser beam 103, 203, 303, 403 Second transmitter 104 , 204, 304, 404 Second receiver 105, 205, 305, 405 Second infrared laser light 106, 206, 306, 406 Third receiver 107, 207, 307, 407 Third infrared laser light 108 215, 313, 408 Roadside wireless device 109, 314, 409 In-vehicle wireless device 110, 315, 410 Vehicle 111, 213, 311, 411 Communication area 112, 214, 312, 412 Trigger pulse 113, 220, 316, 413 Speed detection Detector 114, 221, 317, 414 Moving distance detector 115, 222, 3 8, 415 Vehicle position detector 116, 223, 319, 416 Received power calculator 117, 224, 320, 417 Communication determiner 118, 225, 321, 419 Running lane edge A 119, 226, 322, 420 Running lane edge B 208, 308 Third transmitter 209, 309 Fourth receiver 210, 310 Fourth infrared laser light 211 Fifth receiver 212 Fifth infrared laser light 216 In-vehicle wireless device A 217 In-vehicle A 218 In-vehicle wireless device B 219 Vehicle B 418 Side antenna

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Claims (8)

[Claims] 1. An automatic toll collection device for automatically collecting tolls by wireless communication between a roadside wireless device installed at a tollgate such as a toll road and a vehicle-mounted wireless device mounted on a vehicle passing through the tollgate. In a toll collection system, a first transmitter located on one side of a traveling lane in front of a communication area and emitting a first laser beam in a direction at 90 degrees to a traveling direction of the traveling lane; A first receiver for receiving the first laser light and outputting a first trigger pulse when the vehicle crosses the first laser light, the first receiver being positioned on the other side of the first vehicle; The second laser beam and the third laser beam are located on one side of the traveling lane at the end of the coming communication area, and each of the second laser beam and the third laser beam is moved in the traveling direction of the traveling lane by 9 mm.
A second transmitter that emits in a direction of 0 degrees and a direction of 90 degrees + θ in the communication area direction, and a second transmitter that is located on the other side of the traveling lane at the end of the communication area and is 90 degrees from the second transmitter. A second receiver that receives a second laser beam emitted in the direction and outputs a second trigger pulse when the vehicle crosses the second laser beam, and a communication area beside the second receiver. A third receiver positioned to receive a third laser beam emitted from the second transmitter in the direction of 90 ° + θ and to output a third trigger pulse when a vehicle crosses the third laser beam; A speed detector that detects the speed of the vehicle entering the communication area using the first, second, and third trigger pulses; and a moving distance of the vehicle using data of the speed detector. Moving distance detector, using the data of the moving distance detector A vehicle position detector for detecting the position of the vehicle, a reception power calculator for calculating a distance from the position of the vehicle to the roadside wireless device and estimating a reception power value from the vehicle, An automatic toll collection system, comprising: a communication determiner for comparing the received power value calculated by the received power calculator with the received power value estimated by the received power calculator to determine normal communication. 2. The method according to claim 1, further comprising: transmitting a fourth laser beam and a fifth laser beam between the first and second transmitters located on one side of the traveling lane in front of the communication area. 90 ° to the vehicle and the vehicle traveling direction oblique 90 ° + θ
And a fourth transmitter, which is located on the other side of the side of the traveling lane and receives the fourth laser light emitted from the third transmitter in a 90-degree direction, and the fourth transmitter. A fourth receiver that outputs a fourth trigger pulse when a laser beam crosses a vehicle, and is located between the second and fourth receivers and exits from the third transmitter in a 90 ° + θ direction. A fifth receiver that receives a fifth laser beam and outputs a fifth trigger pulse when the vehicle crosses the fifth laser beam, and a speed detector includes the first, second, and The speed of the vehicle A entering the communication area and the speed of the vehicle B outside the communication area are detected using the third, fourth, and fifth trigger pulses, and the moving distance detector uses the data of the speed detector. The travel distance between the vehicle A and the vehicle B is detected, and the vehicle position detector detects the travel distance. The position of the vehicle A and the position of the vehicle B are detected using the data of the distance detector, and the reception power calculator calculates the distance from the position of the vehicles A and B to the roadside apparatus, and calculates the distance from the vehicles A and B. The communication determination unit estimates a normal communication by comparing the reception power value actually received by the roadside apparatus with the reception power value estimated by the reception power calculator. The automatic toll collection system according to claim 1, wherein 3. The apparatus according to claim 2, wherein the second receiver and the fifth receiver are shared and the number of receivers is reduced by one.
Automatic toll collection system described. 4. A first step board for detecting passage of a vehicle and outputting a first trigger pulse instead of the first transmitter, the first receiver, and the first laser beam, and the second transmission A second tread plate for detecting passage of a vehicle and outputting a second trigger pulse in place of the second machine, the second receiver, and the second laser beam;
Instead of the transmitter, the third receiver, and the third laser light,
The third that detects the passage of the vehicle and outputs the third trigger pulse
2. The automatic toll collection system according to claim 1, wherein said step board is used. 5. The method according to claim 1, wherein the angle of θ of the laser beam emitted in the direction of 90 + θ is smaller than 30 degrees.
Automatic toll collection system described. 6. A third transmitter which emits a fourth laser beam in a direction of 90 ° + θ in a communication area direction is provided at a position of the second receiver, and the second transmitter is provided. The automatic toll collection system according to claim 1, further comprising a fourth receiver that receives the fourth laser light beside the traveling lane. 7. First and second transmitters, first and second receivers, first, second, and third laser beams, speed detectors, moving distance detectors, vehicle position detectors, and reception. 2. The automatic toll collection system according to claim 1, wherein the power calculator is removed, and the communication is determined only by the received power value of the transmission radio wave from the vehicle. 8. The apparatus according to claim 1, further comprising side antennas located on both sides of the roadside apparatus and connected to the roadside apparatus and facing the direction of the adjacent lane. Automatic toll collection system.